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Coals with different reducibility and their macerals in China were chosen as the experimental samples. The pyrolysis and isotherm CO 2 -gasification reactivity and their influencing factors were investigated by thermogravimetric analysis method. The results show that the coal with stronger reducibility has higher pyrolysis reactivity and lower gasification extent than that of the coal with weaker reducibility. With the increase of holding temperature time and pyrolysis final temperature, coal pyrolysis extent increases, while the sample isotherm gasification reactivity presents different properties. Vitrinites show higher pyrolysis reactivity and lower gasification extent than that of raw coals and inertinites. In addition, maceral origin has a remarkable effect on the pyrolysis and isotherm gasification reactivity of coal samples.

Maceral composition and mean reflectance are considered to be important parameters influencing the coal combustion characteristics. The combustion characteristics and kinetics of Lingwu coal and corresponding macerals were researched by means of the thermogravimetric analysis method. The results showed that inertinite has slightly higher combustion activity than that of raw coal and vitrinite, but it is also responsible for last carbon loss. As inertinite content increases, the combustion activity of the blending sample increases slightly, whereas the last carbon conversion reduces. The shrinking core model is used to illustrate the sample combustion mechanism. With increasing heating rate, the activation energies and pre-exponent factors decrease on sample combustion.